​Model N701
Zero Air System


092910740A - MANUAL,USER, N701, N701H.pdfN701/N701H Manual7104 KB
ESD Fundamentals - 04786.pdfFundamentals of Electro-Static Discharge (ESD)216 KB
SAL000076K - Environmental Instruments Overview.pdfEnvironmental Instruments Overview610 KB
SAL000128A - N701.pdfN701 Specifications920 KB


 Maximum Output 18 SLPM at 30 psig​
Dew Point -20ºC up to 15 SLPM / -10ºC above 15 SLPM
Dryer Regenerative, heatless dryer with lifetime of greater than 5 years
Output Concentration SO2 < 0.1 ppb
H2S < 0.1 ppb
NO < 0.1 ppb
NO2 < 0.1 pp​b
NH3 < 0.1 ppb
O3 < 0​.4 ppb
CO < 20 ppb (requires CO scrubber option)
Hydrocarbons < 5 ppb (requires hydrocarbon scrubber option)
Compressor Internal long-life, oil-less piston pump
Power Requirements 110V-120V, 60 Hz
220V-240V, 50/60 Hz
Operating Temperature Range 5 - 40ºC
Dimensions (HxWxD) 8.75” x 17” x 28” (222 x 432 x 711.2 mm)
Weight Without options: 56 lbs (25.4 kg)
 Optional I/O

Specifications are subject to change without notice.
All specifications are based on constant conditions.​​
1 x Ethernet: 10/100Base-T
1 x RS232 (57,600 baud)
MODBUS Protocol Support


  • Long-life scrubbers
  • ​Regenerative, heatless dryer
  • ​Optional CO or CO/Hydrocarbon scrubber
  • Easy disassembly for routine maintenance
  • Dew point indicator
  • Optional Modbus connectivity
  • Automatic pump control & water drain


The N701 is a fully self-contained source of clean, dry air for dilution calibrators. It can also simultaneously be used as a pressure source for activating instrument pneumatic valves and/or purge air for permeation tube ovens. The N701 includes a dewpoint sensor, an oil-less and diaphragm-free pump, and scrubbers to remove SO2, NO, NO2, O3, H2S, and NH3. An optional high performance heated converter is available for effective removal of Carbon Monoxide (CO) and Hydrocarbon gases.

The regenerative, heatless dryer removes water and produces output with a dew point of less than -20°C (flow rate of up to 30 SLPM at 30 psig, at sea level). The system's pressure, temperature, and dew point values are all continuously monitored, which allows a microcontroller to adjust the pump cycling frequency, valve timing, and heater power for optimal performance.

The N701 has optional digital communications including RS232 and TCP/IP with Modbus communications. This allows remote monitoring of key instrument functions including dewpoint status, scrubber temperature, box temperature, and output pressure. Additionally, this digital access provides the ability to remotely disable the internal pump, allowing longer service intervals and less power consumption. The user can also remotely start instrument warm-up prior to arrival at the site.